Method of increasing the oxidation stability of biodiesel
AssigneeDegussa AG
InventorsHark-Oluf Asbahr, Thomas Bomba
Life of this patent
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Abstract
A method of increasing the oxidation stability of biodiesel, by addition of at least one primary antioxidant of formula I to the biodiesel to be stabilized, in an amount of from 10 to 20 000 ppm (w/w); a biodiesel stabilized by the at least one primary antioxidant of the formula I; and a method of preventing corrosion, blockages in injection pumps, blockages in fuel lines, or a combination thereof, in engines, heaters, or machines utilizing biodiesel as a fuel source, the method being adding the compound of formula I to the biodiesel of the engines, heaters, or machines.
Claims21
A method of increasing the oxidation stability of biodiesel, comprising adding at least one primary antioxidant having the structure of formula I
- wherein A=or —S—;
- wherein n=1 to 5;
- wherein E is a methyl methyl radical, a tert-butyl radical,
- wherein each E may be the same or different;
- wherein each of R1, R4 and R5 may, independently, be the same or different and are hydrogen or an alkyl group;
- and
- wherein each R2 is, independently, a hydrogen or a methyl group;
- to the biodiesel to be stabilized in an amount of from 10 to 20,000 ppm (w/w).
A method of preventing corrosion, blockages in injection pumps, blockages in fuel lines, or a combination thereof, in engines, heaters, or machines utilizing biodiesel as a fuel source, comprising
- adding at least one primary antioxidant comprising at least one compound having the structure of formula I
- wherein A=or —S—;
- wherein n=to S;
- wherein E is a methyl radical, a tert-butyl radical,
- wherein each E may be the same or different;
- wherein each of R1, R4 and R5 may, independently, be the same or different and are hydrogen or an alkyl group;
- and
- wherein each R2 is, independently, a hydrogen or a methyl group;
- to biodiesel located in an engine, heater, or machine.
An oxidation-stabilized biodiesel comprising from 10 to 20,000 ppm (w/w) of at least one primary antioxidant having the structure of formula I
- wherein A=or —S—;
- wherein n=1 to 5;
- wherein E is a methyl radical, a tert-butyl radical,
- wherein each E may be the same or different;
- wherein each of R1, R4 and R5 may, independently, be the same or different and are hydrogen or an alkyl group;
- and
- wherein each R2 is independently, a hydrogen or a methyl group.
Dependencies are inferred from the claim text.